Engineering .NET Application Developer

As a part of the global industrial organization Marmon Holdings—which is backed by Berkshire Hathaway—you’ll be doing things that matter, leading at every level, and winning a better way. We’re committed to making a positive impact on the world, providing you with diverse learning and working opportunities, and fostering a culture where everyone’s empowered to be their best.

Who We Are

Coilmaster is a leading manufacturer of heat exchangers and HVAC equipment, serving commercial and industrial markets across the U.S. We are an increasingly software-driven organization, relying on advanced in-house engineering applications to support equipment selection, simulation, and performance modeling across multiple manufacturing sites. As part of the Marmon family of companies, Coilmaster combines deep engineering expertise with scalable technology to deliver reliable, high-quality solutions for our customers.

Coilmaster Corporation’s IT team powers core business functions across multiple manufacturing locations. We’re committed to delivering reliable, high-performance software solutions that support both internal operations and customer-facing systems.

What You'll Do

• Serve as a technical lead for Coilmaster’s engineering software platforms used across multiple manufacturing locations

• Lead end-to-end development of equipment selection and simulation tools, from feature definition and design through deployment and support

• Maintain and modernize legacy VBA and Visual Basic applications through disciplined issue triage, high-quality fixes, and planned enhancements

• Lead new development in C# and .NET with a focus on new features, reliability, and long-term maintainability

• Develop and support full-stack solutions, including front-end UI/UX, back-end services and APIs, engineering calculation engines, and data integrations

• Translate HVAC and thermal engineering models into accurate, testable software that solves real-world customer engineering problems

• Apply modern software engineering practices such as Git-based workflows, automated testing, code reviews, and CI/CD

• Collaborate with cross-functional teams across three U.S. manufacturing sites and with other developers across Marmon

• Document design decisions and architecture while upholding secure coding, version control, and security standards

What You'll Need

• Bachelor’s degree in Mechanical Engineering, Software Engineering, Computer Engineering, or a related field

• Master’s or PhD preferred

• 7+ years of combined experience delivering production software and engineering applications

• Strong proficiency in C# and .NET using Visual Studio

• Experience maintaining and modernizing legacy engineering software, including VBA, Visual Basic, or VB.NET

• Working knowledge of SQL Server and relational database design

• Experience with Windows Forms, web applications, APIs, and data integrations

• Familiarity with Agile development practices and CI/CD workflows

• Strong debugging skills, root-cause analysis capability, and attention to reliability

• Ability to communicate clearly with both technical and non-technical stakeholders

• Strong mechanical engineering knowledge related to HVAC and heat exchangers

What You'll Gain

• Competitive pay aligned with experience and market benchmarks

• Comprehensive benefits including medical, dental, and prescription coverage

• 401(k) retirement plan with company matching

• A highly visible role influencing Coilmaster’s engineering software roadmap

• Ownership of mission-critical systems that directly support customers and manufacturing operations

• The opportunity to work at the intersection of mechanical engineering and modern software development

• Collaboration with experienced engineering, manufacturing, and IT teams across Coilmaster and Marmon

• A primarily office-based role with limited travel to three U.S. manufacturing sites

Following receipt of a conditional offer of employment, candidates will be required to complete additional job-related screening processes as permitted or required by applicable law.

We are an equal opportunity employer, and all applicants will be considered for employment without attention to their membership in any protected class. If you require any reasonable accommodation to complete your application or any part of the recruiting process, please email your request to [email protected], and please be sure to include the title and the location of the position for which you are applying.